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# Jang geun Choi

### Pusan national university

887 total contributions since 2014

I'm a student studying ocean science using matlab.

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Submitted

Physical oceanography: wave and energy conservation
Calculate wave and its energy

3 years ago | 2 downloads |

Submitted

Physical oceanography: wave equation (two-dimensional)
Simulate two-dimensional wave

3 years ago | 6 downloads |

Solved

Freebies anyone? No!!!!
Feel free to copy paste all the tests and voila you solved the problem

3 years ago

Problem

Calculate solution of given polynomial
For example, y=function([3 -2 -4]) In here, input vector indicate 3*x^2-2*x-4, y is solution of former equation. y=[1.5...

3 years ago | 1

Problem

Print true if
all elements are larger than 5 a=[1 3 5 8 6]; b=[6 6 6 6 6]; function(a) should be false, and function(b) will be tru...

3 years ago | 1

Problem

Solve the system of linear equations
4x - 2y +6z=8 2x + 8y +2z=4 6x + 10y +3z=0 Find x,y,z. Output should be a=[x;y;z].

3 years ago | 4

Problem

Save variables
a=[1] Save variable a that is located in workspace into current folder. File name should be 'a.mat'

3 years ago | 3

Problem

Change matrix to vector2
From x = 4 3 5 1 5 1 To y = 4 3 5 1 ...

3 years ago | 5

Problem

Change matrix to vector
Vector is a matrix whose size is 1 x n or n x 1. Change matrix to vector. x = 4 3 5 1 ...

3 years ago | 6

Problem

How to calculate log?
There is a log that have base 5. How to calculate? log5(x)?

3 years ago | 6

Problem

Calculate some equation
Using given inputs x and z, make two outputs that are y1=(xz)/(x/z)^2+14x^2-0.8z^2 y2=x^z-z^x+(x/z)^2-(z/x)^2

3 years ago | 5

Submitted

Physical oceanography: wave equation (open boundary)
Simulate wave in the open boundary

3 years ago | 4 downloads |

Problem

Calculate inverse matrix in m by n matrix
x=(1:10)' y=roundn(2*x+7*rand(size(x)),-1) a*x=y Estimate a using inverse matrix calculation. This is principle of li...

3 years ago | 5

Problem

Calculate area of sector
A=function(r,seta) r is radius of sector, seta is angle of sector, and A is its area.

3 years ago | 5

Solved

Additive persistence
Inspired by Problem 2008 created by Ziko. In mathematics, the persistence of a number is the *number of times* one must apply...

3 years ago

Solved

Polynomial division
Divide a polynomial u by polynomial v and return the quotients only. Example: u = x^4+3*x^3+5*x+3 v = x^2+1 Answer: ...

3 years ago

Solved

Make a Plot with Functions
Make a plot and test

3 years ago

Solved

Accessing elements on the diagonal
Access the diagonal elements of a matrix without 'diag' function

3 years ago

Solved

Remove NaNs and numbers adjacent to NaNs
The aim is to remove the elements before and after NaN occurrences inside a vector. For example: x = [6 10 5 8 9 NaN 23 1...

3 years ago

Solved

Calculate the nth Fibonacci number USING 'Golden Ratio' concept
f = [1 1 2 3 5 8 13 ...] If n=6, f(6)=8

3 years ago

Solved

Solving a quadratic equation
Given a, b ​​and c, Return the solution of the following quadratic equation: a*x^2 + b*x + c = 0.

3 years ago

Solved

square root
Find the square root (y) of an input (x).

3 years ago

Solved

Weave two vectors into one
Weave the two given vectors into one as shown below. Example: If a = [1 1 1] b = [0 0 0] then y = [1 0 1 0 ...

3 years ago

Solved

Calculate the integral of the polynomial
for e.g. in = [3 2 1] out = [1 1 1 0]

3 years ago

Solved

Find out magnitude of vector
Find out magnitude of vector. Say x=[1 2 3], then answer must sqrt(1^2+2^2+3^2) Please don't use sum function. If you l...

3 years ago

Solved

Largest Prime Number
Given a matrix X, find the largest prime number in X.

3 years ago

Solved

Evaluate Polynomial
Given a polynomial equation coefficients in a vector p, you have to return its value at x. Example: For inputs p and x ...

3 years ago

Solved

Convert a Cell Array into an Array
Given a square cell array: x = {'01', '56'; '234', '789'}; return a single character array: y = '0123456789'

3 years ago

Solved

Sum the real and imaginary parts of a complex number
Sum the real and imaginary parts of a complex number. Example c = 1+2i has the solution 1 + 2 = 3

3 years ago

Solved

ascii value
let input='a' output=97

3 years ago

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